G21.1Header code — not billable
Other drug-induced secondary parkinsonism
- Chapter
- 6. Diseases of the nervous system
- Category
- G21
- Effective date
- October 1, 2026
Related codes in category G21
G21Secondary parkinsonismG21.0Malignant neuroleptic syndromeYesG21.11Neuroleptic induced parkinsonismYesG21.19Other drug induced secondary parkinsonismYesG21.2Secondary parkinsonism due to other external agentsYesG21.3Postencephalitic parkinsonismYesG21.4Vascular parkinsonismYesG21.8Other secondary parkinsonismYesG21.9Secondary parkinsonism, unspecifiedYes
Frequently asked questions
What is ICD-10 code G21.1?
G21.1 is an ICD-10-CM diagnosis code for Other drug-induced secondary parkinsonism.
Is G21.1 a billable code?
No. G21.1 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is G21.1 in?
G21.1 falls under Chapter 6: Diseases of the nervous system.
When did G21.1 become effective?
G21.1 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to G21.1?
G21.1 belongs to category G21, which includes 9 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.